Click on Network on the left side menu, then + Create Network on the right and follow the prompts.

Network Name should be TENANT-NAME-net. Click "Next".

Subnet Name should be TENANT-NAME-subnet. Network Address shold be192.168.0.0/24. Gateway IP should be 192.168.0.1. Click "Next".

Make sure Enable DHCP is checked. DNS Name Servers should be:

129.114.97.1

129.114.97.2

129.116.84.203

Click Create.

Click on Routers on the left bar and then the + Create Router button on the right.Router Name should be TENANT-NAME-router. Click the Create router button.

Click the Set Gateway button on the newly created router. Select Public-Network from the External Network menu. Click Set Gateway.

Click on the router name to see its details. Then click the + Add Interface button.

Create an interface for the router. Choose the TENANT-NAME-net network from the Subnet list. Click Add interface.

Click on Network Topology. It should look like the picture below. Note the router between the TENANT-NAME-id network and the Public-Network. This allows your private tenant network to communicate with the outside world.